Rock-drill



NiTED STATES POWELL BADER, OF GEORGETOWN, TEXAS.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 355,278, dated December 28, 1886.

Application tiled May l2, 1886. Serial No. 201,987.

To all whom, it may concern:

Be it known that I, POWELL BADER, a citizen of the United States of America, residing at Georgetown, in the county of Villiamson and State of Texas, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention pertains to certain new and useful improvements in bits for rock-drills; and it consists in the peculiar formation of the bit, whereby the drilling` operation is more efficiently performed than heretofore, substantially as hereinafter fully set forth, and particularly pointed in the claims.

In the accompanying drawings, Figure `l is aview in side elevation of myinvention. Fig.

2 is a front or plan view of the cutting-edge thereof, and Figs. 3 and 4 are similar views of modifications.

In carrying out my invention, I employ the bit A, having a preferably rectangular shank, and on either side face thereof I form a curved recess, C, which recess starts on` the right-hand end of each side of said face and gradually deepens toward the left-hand lateral edge of said bit, atwhich pointis formed apassage-way or groove, d, the purpose of which will appear further on.

Upon the eXtreme lower end of the bit is formed a zigzag blade-edge, D, connecting with notches E, formed in said end, which notches are alternately arranged thereon, causing the blade-edge to' present an approximately inverted-V shape in side elevation. The bladeedge and notches are arranged on an inclined, plane extending from the upper left-hand corner to the lower right-hand corner thereof.

In operation the rock dbris will be removed by the impact of the curved recesses C there- (No model.)

on, said dbris rst passing along the passageways or grooves d, thence up along the sides of the bit in the recesses formed therein.

In Figs. Sand 4 I have shown modified forms of the cutting-edges of my bit, bythe employment of which the same object is accomplished as by the employment of the before-described device.

I am aware that it is not new to provide roclr-drillbits with an inclinedbase having a number of cutting-ribs terminating in corresponding ribs on the cutting-edge, also arockdrill having a straight cutting edge and twisted cheeks arranged diagonally on opposite faces and terminating in said cutting-edge; but my invention is designed as an improvement over such devices, by means of which I produce a device that is simple, cheap, and'in` every vway durable.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a bit for rock-drills, the combination,

2. The combinatiomwith the bit having the curved recesses in either face thereof, of the cutting-edge having blades and recesses and the passage-ways or grooves, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

POWELL BADER. NVitnesses:

W. E. CHAPMAN, E. MUNGER. 

